Which statement about thiophene is incorrect?

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Which statement about thiophene is incorrect?

Which statement about thiophene is incorrect? Thiophene is polar. Thiophene is more reactive with electrophiles than furan.

What is the correct reaction sequence for pyrrolefuran and thiophene to electrophiles?

All aromatic five-membered heterocycles undergo electrophilic substitution and have a general reaction sequence: Pyrrole >> Furan> Thiophene> Benzene.

Is thiophene an aromatic compound?

Thiophene is a heterocyclic compound with the molecular formula C4H4S.consists of a planar five-membered ring, which is aromatic as shown by its extensive substitution reaction. It is a colorless liquid with a benzene-like odor.

Which of the following statements is true that pyrrole is a strong base?

The electron pair present on pyrrole is not readily available for protonation. These electrons are necessary for aromaticity by keeping the electron hexatet in the ring.So, pyrrole is not a strong base. So, option 2 is incorrect.

Which heteroatom is present in thiophene?

The heteroatoms O and S are present in the ring, respectively. Furan is an oxygen-containing heterocycle used primarily for conversion to other substances, including pyrrole.Thiophene is a sulfur Contains heterocycles with chemical and physical properties similar to benzene.

Heterocycle part 1: furan, thiophene and pyrrole

37 related questions found

Is pyridine acidic or basic?

The nitrogen center of pyridine has a pair of basic lone electrons.This lone pair does not overlap the aromatic π-system ring, so the pyridine is basicwith chemical properties similar to tertiary amines.

Is thiophene acidic or basic?

Pyrrole, furan or thiophene don’t have any bond to electrons to release freely, that’s why they shouldn’t release basicbut organic chemistry lecturers say they are basic because they react with hydrochloric acid to form salts.

Which is the least basic compound?

NI3 is the most basic, because iodine has an empty d orbital, so it can accept a lone pair of electrons from nitrogen and contribute to back bonding. Furthermore, the basicity decreases as the groups decrease, so NI3 is also less basic than any other given compound.

Which drug contains a pyrrole nucleus?

The three drugs that contain the pyrrole ring are Atorvastatin, Tolmetinand Atorak.

What is a more basic pyridine or pyrrole?

In simple terms, we can say that lone pair nitrogens in pyrrole resonate and therefore cannot donate, whereas lone pair nitrogens in pyridine are localized and thus readily donate hydrogen ions. so, Pyridine is more basic than pyrrole.

What is the hybridization of S in thiophene?

At first glance, thiophene appears to have only four pi electrons in the butadiene system, plus one sp3 hybridized sulfur atom There are two electron pairs. However, if the sulfur atom is rehybridized with sp2, it will have an electron pair in the 3p orbital that can overlap with the carbon 2p orbitals on either side.

Does thiophene sp2 hybridize?

this sp2 hybrid ring Atoms are connected by brown bonds, and the pi electron pairs and bonds that make up the aromatic ring are blue. …for thiophene, the sulfur analog of furan, where one sulfur electron pair (blue) is involved in aromatic ring π-electron conjugation.

Which is more reactive, thiophene or furan?

In terms of reactivity comparisons, furan It is between pyrrole and thiophene, that is, it is less active than pyrrole, but more active than thiophene.

Why is thiophene more stable than furan?

Answer: Since N is less electronegative than O, N with a positive charge will be slightly more stable than O. therefore, Pyrrole is more aromatic than furan.

Which is more stable, thiophene or pyridine?

In this example, pyridine is the more efficient base.with pyrrole and Furanthiophene more stable. Since nitrogen is much less electronegative than oxygen, it is hardly more stable than oxygen at this effective rate. …pyridine > pyrrole > furan > thiophene.

Why is thiophene less reactive than pyrrole and furan?

Sulfur’s 3pz orbital overlaps with carbon’s 2pz orbital less efficiently, and therefore has a worse shared electron density than furan’s oxygen, Stable carbocation intermediate lessmaking thiophene less reactive to EAS than furan.

Which medicines contain pyrrole rings?

Commercially available drugs containing the pyrrole ring system are known to have many biological properties, such as Antipsychoticsβ-adrenergic antagonists, anxiolytics, anticancer drugs (leukemia, lymphoma and myelofibrosis, etc.), antibacterial drugs, antifungal drugs, antiprotozoal drugs, antimalarial drugs, etc.

How do you cook pyrrole?

Pyrrole is prepared industrially Treatment of Furan with Ammonia in the Presence of a Solid Acid Catalyst, such as SiO2 and Al2O3. Pyrroles can also be formed by catalytic dehydrogenation of pyrrolidine.

Which is a weakly basic amine?

The presence of alkyl groups in alkylamines increases the electron density on the N atom through the +I effect. However, aniline The phenyl group is less basic due to its -I effect, ie it withdraws electrons, making the electrons on the nitrogen less effective for protonation.

Which is the more basic compound?

In benzylamine, the lone pair of electrons is not conjugated or attached to the benzene ring, and thus is free to donate to electrophiles (i.e., electron-deficient groups) or bind to other elements.so Compound benzylamine is the most basic compound in the given options.

Why is NF3 the most basic than ni3?

NF3 is the most basic because F is the most electronegative, it attracts the lone pair of electrons of the N atom So electrons will be donated in lesser form. As the size of the halide ion increases, the electronegativity of the halide ion decreases and the essential characteristics of NX3 increase.

Is pyrrole basic or acidic?

Pyrrole is Weak acid compound (pKa = 17.5) The pyrrole anion is a strong base due to the presence of the imino hydrogen atom. The acidic character can be explained by two factors: (i) the bonding electrons are more strongly bound to the pyrrole nitrogen due to the larger s character in the NH bond in pyrrole.

Where is thiophene found?

it occurs with benzene in coal tar, its source was first isolated in 1883. Today, thiophenes are prepared commercially from butane or butene and sulfur or sulfur dioxide. Certain thiophene derivatives occur in the form of plant pigments and other natural products.

Is benzene more basic than furan?

However, their aromatic intensity is much lower than that of benzene. Their resonance energy is also much lower than that of benzene. Even so, they all undergo electrophilic substitution. No, furan should be more basic than pyrrole.

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